The soldier is basically providing suppression of enemy defenses for whatever reason. It may also be to just being an irritant, which soldiers across the LOC do. For that he doesn't need to aim and shoot at anyone, just spray a few clips in the general direction of the enemy. Now he changes mags very quickly and checks the chambers before loading another mag. Std procedure. With such rapid firing and emptying the clips, there is bound to be a jam or two, as with any other automatic firearm.
All those gloating on finding this video of the gun apparently getting jammed, pat yourselves on your backs!!